A dynamic high-flying city lawyer, Bryony Willis, receives a note to say that her terrorist father was not accidentally killed by his own bomb in 1982 but was actually murdered by the police. The UCOS team interviews Bryony's mother, who raised her on Greenham Common, and stumbles upon a dangerous, high-powered police cover-up. Sasha's ex-husband Ned tries to win her back. Is she tempted? Or has too much water passed under the bridge?

The episode was rated 7.54 from 59 votes.

Tragedy strikes for Griffin when a friend is found murdered. Gerry has to move in to McAndrew's flat, which causes problems at work.

The episode was rated 7.61 from 57 votes.

The arrest of a Turkish barmaid working in London illegally reopens the cold case of a landlord who died in a suspected arson attack on his City pub. Gerry and Steve take a trip out to a vineyard in Kent while Griffin indulges his passion for fruit machines. When Miller decides to get the boys match fit for a charity football game it proves more difficult than she imagined.

The episode was rated 7.72 from 60 votes.

The team investigate the unsolved killing of brilliant young doctor Lydia Dryden in a case that takes them into the two very different worlds of public and private medicine. Danny Griffin is bereft when daughter Holly leaves home to start university, so his UCOS colleagues throw some fun distractions his way. And he might even be about to acquire a pet...

The episode was rated 7.73 from 71 votes.

The team investigate the death of a personal trainer who had belonged to a Roman re-enactment society and discover a gang selling illegal steroids, but the motive for murder may not be all it seems. And Danny Griffin starts to become attracted to his forensic pathologist colleague Fiona Kennedy, just as he receives some troubling news about his wife.

The episode was rated 7.81 from 57 votes.

When a teenager is caught throwing a brick from a motorway bridge, his DNA provides a partial match with the murderer of an interpreter in 2010. Steve is faced with the chance to lay some ghosts to rest when his terminally ill father comes to stay.

The episode was rated 7.82 from 61 votes.

Family ties affect both Gerry Standing and Sasha Miller. While Sasha is forced to work with ex-husband Ned as he fills in for Strickland, Gerry returns to his roots in Bermondsey to help arrange his daughter's wedding. As a consequence he is thrown into a case involving the possible murder of an architecture student who is also the grandson of an old friend. Meanwhile, Danny Griffin has been on an FBI course in reading body language.

The episode was rated 7.82 from 73 votes.

A mix tape from 1983 is discovered, containing the voice of a teenage girl who was murdered shortly after it went into her school's time capsule. Sasha is distracted by a romantic entanglement with a charming record shop owner. Gerry is dreading his future son-in-law's stag night.

The episode was rated 7.83 from 60 votes.

When Steve McAndrew's teenage son Stewie is arrested for drug possession, he finds himself face to face again with his ex-wife Tricia as they try to save the boy from a downward spiral. And after a distressed dementia patient escapes her care home to report a murder, the team look into the disappearance of a policeman, possibly murdered but missing since 1956...

The episode was rated 7.87 from 62 votes.

Tension mounts as Ned and Sasha are forced to work together when the body of a film critic found in a sewer is thought to be linked to the 20-year-old murder of a concept artist, David Straka. As the team interview Straka's contemporaries, groupies and assistants, looking for possible connections between the deaths, they find themselves immersed in the macabre world of the occult. And Griffin's expert knowledge of the history of London and in particular the hidden Fleet River, proves invaluable.

The episode was rated 7.97 from 61 votes.